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Schedule of borrowings classified by interest rate and currency (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
IfrsStatementLineItems [Line Items]        
Total borrowings $ 1,438 $ 1,614 $ 1,947 $ 2,177
Fixed interest rate [member]        
IfrsStatementLineItems [Line Items]        
Total borrowings 1,329 1,371    
Fixed interest rate [member] | Argentinian Pesos [Member]        
IfrsStatementLineItems [Line Items]        
Total borrowings 11 53    
Fixed interest rate [member] | U S Dollar [Member]        
IfrsStatementLineItems [Line Items]        
Total borrowings 1,318 1,318    
Floating interest rate [member]        
IfrsStatementLineItems [Line Items]        
Total borrowings 87 215    
Floating interest rate [member] | Argentinian Pesos [Member]        
IfrsStatementLineItems [Line Items]        
Total borrowings (0) 133    
Floating interest rate [member] | U S Dollar [Member]        
IfrsStatementLineItems [Line Items]        
Total borrowings 87 82    
Non Interest Accrues [Member]        
IfrsStatementLineItems [Line Items]        
Total borrowings 22 28    
Non Interest Accrues [Member] | Argentinian Pesos [Member]        
IfrsStatementLineItems [Line Items]        
Total borrowings (0) 8    
Non Interest Accrues [Member] | U S Dollar [Member]        
IfrsStatementLineItems [Line Items]        
Total borrowings $ 22 $ 20